<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      /* 1. */
      /* .box {
        display: flex;
        flex-direction: column;

        .box1,
        .box2,
        .box3 {
          width: 50px;
          height: 50px;
          border: dashed pink;
          background-color: lightblue;
        }
      } */
      /* .box {
        width: 600px;
        height: 200px;
        background-color: rgb(235, 145, 145);
        display: flex; */
      /* 换行 */
      /* flex-wrap: wrap; */
      /* flex-wrap: wrap-reverse; */
      /* 项目在主轴上的对齐方式 */
      /* justify-content: flex-start; */
      /* justify-content: flex-end; */
      /* justify-content: center; */
      /* justify-content: space-between; */
      /* justify-content: space-around; */
      /* 项目在交叉轴上的对齐方式 */
      /* align-items: flex-start; */
      /* align-items: flex-end;  */
      /* align-items: center; */
      /* align-items: stretch; */

      /* .box1, */
      /* .box2,
        .box3 {
          width: 50px;
          height: 50px;
          border: dashed pink;
          background-color: lightblue;
        }*/
      /*3.  */
      /* .a{
        border: solid pink;
        flex-start
      }*/

      /* 4. 过渡*/
      /* .box {
        display: inline-block;
        width: 200px;
        height: 200px;
        background-color: pink;
        transition: all 1s;
        &:hover {
          height: 500px;
          width: 500px;
        }
      } */
      /* } */
    </style>
  </head>
  <body>
    <!-- 1.flex-derection项目在主轴排列方向 -->
    <!-- <div class="box">

      <div class="box1">1</div>
      <div class="box2">2</div>
      <div class="box3">3</div>
    </div>

    <div class="box">
      <div class="box1">4</div>
      <div class="box2">5</div>
      <div class="box3">6</div>
    </div> -->
    <!-- 2. -->
    <!-- <div class="box">
      <div class="box1">1</div>
      <div class="box2">2</div>
      <div class="box3">3</div>
      <div class="box1">1</div>
      <div class="box2">2</div>
      <div class="box3">3</div>
      <div class="box1">9</div>
      <div class="box2">9</div>
      <div class="box3">9</div>
    </div> -->
    <!-- 3. -->
    <!-- <div class="box">
        <div class="a">1111</div>
        <div  class="a">11111</div>
        <div  class="a">11111111</div>
        <div  class="a">1111111111</div>
        <div  class="a">111111111111</div>
    </div> -->

    <!-- 4. -->
    <!-- <div class="box"></div> -->
  </body>
</html>
